Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A 2D Controller Design Method for Interval Time Delay in Injection Molding Process

A design method and controller technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve problems such as poor anti-interference ability, influence on system control performance, difficulty in obtaining simplified/approximate models, etc.

Active Publication Date: 2017-01-11
GUANGZHOU HKUST FOK YING TUNG RES INST
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the injection molding process produces products in a batch mode, and the operating states of each stage often need to be adjusted in a large range, so it is difficult to obtain a simplified / approximate model that is suitable for traditional controller design and can guarantee control performance requirements
[0006] (2) The anti-interference ability of the intermittent process is generally poor, mainly because the capacity of the intermittent production equipment is generally small, and external interference, switching of production stages and changes in process characteristics may have an impact on the control performance of the system
[0007] (3) Control performance is difficult to guarantee and cannot be improved
[0009] However, the time lag phenomenon is inevitable in the injection molding process, and its existence may affect the stability and performance of the system, resulting in a higher defective rate in the product
When the system has time-delay, if the controller designed for no time-delay is used for control, the control performance (such as tracking performance) and system stability of the system will be deteriorated

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A 2D Controller Design Method for Interval Time Delay in Injection Molding Process
  • A 2D Controller Design Method for Interval Time Delay in Injection Molding Process
  • A 2D Controller Design Method for Interval Time Delay in Injection Molding Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This embodiment describes the specific process of converting the constructed state space model into a 2D error augmented model by using the design method of the 2D-FM model.

[0062] The concrete process that the present invention converts the state-space model of construction into 2D error augmentation model is as follows:

[0063] First, according to the repetitive characteristics of the injection molding process, the iterative learning control law is designed as:

[0064] ∑ ilc u (t,k)=u(t,k-1)+r(t,k)(u(t,0)=0,t=0,1,2,...,T)...(1):

[0065] Then, define the current batch output error as:

[0066] e(t,k)=y(t,k)-y d (t) ... (2)

[0067] And define the batch direction error as:

[0068] x Δ (t,k)=x(t,k)-x(t,k-1)...(3)

[0069] According to formulas (1), (2) and (3), it can be obtained:

[0070]

[0071]

[0072] in,

[0073] ω(t,k)=(Δ a (t,k)-Δ a (t,k-1))x(t,k-1)+(Δ d (t,k)-Δ d (t, k-1))x(t-d(t), k-1)+(Δ b (t,k)-Δ b (t, k-1))u(t, k-1).

[0074] Co...

Embodiment 2

[0077] This embodiment describes the specific process of solving a given stability criterion (that is, solving the gain K of the controller in the form of linear matrix inequality).

[0078] The specific method is as follows:

[0079] First minimize γ, and let L i >0, Q - 1 > 0 , W - 1 > 0 , W ~ 1 > 0 , x 1 >01, R ~ 1 L ~ 1 L ~ 1 X ~ ...

Embodiment 3

[0082] This embodiment is an embodiment of the present invention applied to injection speed control.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a 2D controller design method for interval time lag in the injection modeling process. The method comprises the steps that A, a state space model is established according to a control requirement of parametric variables in the injection modeling process; B, according to the repeated operation characteristic of the injection modeling process, the established state space model is converted to be a 2D error augmentation model by a 2D-FM model design method; C, a controller meeting a control law r (tk) is designed according to the 2D error augmentation model; D, a linear matrix inequation mode is used for solve the gain K of the controller. The 2D controller design method directs at the time lag phenomenon existing in the injection modeling process to establish the state space model based on a two-dimensional system theory, a 2D-FM model is used for designing the controller, the system can be quickly stabled in the injection modeling process, tracking can be conducted quickly, and the system can be still kept in good control performance even though the system is influenced by time lag. The 2D controller design method for interval time lag in the injection modeling process can be widely applied to the technical field of injection modeling.

Description

technical field [0001] The invention relates to the technical field of injection molding, in particular to a 2D controller design method aiming at interval time lag in the injection molding process. Background technique [0002] The injection molding process is a complex industrial manufacturing process, and the quality of injection molded products depends on material parameters, machine parameters, process parameters and the interaction of these parameters. The quality of injection molded products includes many aspects, such as appearance quality, dimensional accuracy and mechanical (optical, electrical) performance and so on. These quality indicators are jointly determined by the materials used in the processing process, the mold and the control accuracy of the process parameters. At the same time, there are various interference factors in different links of the injection molding process. [0003] The injection molding process is a typical batch production process with a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
Inventor 王立敏高福荣姚科莫胜勇
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com